THE RELATION BETWEEN THE RESPONSES BY AMŒBA TO MECHANICAL SHOCK AND TO SUDDEN ILLUMINATION

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Abstract
Amoeba responds both to mechanical shock and to sudden illumination by a cessation of movement, which does not take place immediately on stimulation but after a considerable reaction time, depending upon the magnitude of the stimulus. In both instances the time during which the amoeba is inactive also increases with the magnitude of the stimulus. After an amoeba has been exposed to light, or a mechanical shock, it must be allowed time for recovery before it responds to a 2nd stimulus. After a response to light, time must be allowed for recovery before the amoeba will react to mechanical shock, and vice versa. The effect of one kind of stimulus upon the response to another leads to the inference that the processes occurring during the refractory periods following the reactions caused by mechanical shock and by sudden illumination are basically the same.

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